CVE-2025-47159 in Windows
Summary
by MITRE • 07/08/2025
Protection mechanism failure in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 08/16/2025
This vulnerability represents a critical protection mechanism failure within Windows Virtualization-Based Security VBS enclaves that enables local privilege escalation for authenticated attackers. The flaw resides in the virtualization-based security framework that employs hardware isolation to protect sensitive system components and processes. When an attacker with legitimate user credentials can exploit this weakness, they gain the ability to execute code with elevated privileges typically restricted to system-level operations.
The technical implementation of VBS enclaves relies on hypervisor-protected containers and secure enclaves to isolate critical system functions from potential threats. However, this particular vulnerability demonstrates a failure in the validation mechanisms that should prevent unauthorized access to protected resources within these virtualized environments. The flaw likely stems from inadequate input sanitization or improper privilege checks during enclave operations, allowing malicious code execution that bypasses normal security boundaries.
From an operational impact perspective, this vulnerability significantly undermines the core security assumptions of Windows VBS implementations. Attackers can leverage this weakness to gain system-level privileges without requiring administrative credentials or complex exploitation techniques. The attack surface extends beyond simple local privilege escalation, as compromised enclave environments can potentially provide access to sensitive cryptographic keys, credential caches, and other protected system resources. This represents a fundamental failure in the security architecture that affects all Windows systems implementing VBS features.
The vulnerability aligns with CWE-284 Access Control Bypass and maps to ATT&CK technique T1068 Privilege Escalation through exploitation of virtualization-based security mechanisms. Organizations using Windows Defender Application Control, Credential Guard, or other VBS-dependent security features face elevated risk from this flaw. The attack vector requires local system access but does not necessitate network connectivity or complex external exploitation, making it particularly dangerous in environments where user accounts have broad local privileges.
Recommended mitigations include immediate deployment of Microsoft security updates that address the specific VBS enclave validation issues. System administrators should also consider implementing additional layered defenses such as enhanced monitoring for suspicious enclave activity and strict access controls on system resources. Organizations should review their VBS configurations to ensure proper isolation boundaries and consider temporary disabling of VBS features until comprehensive patching is complete. Regular security assessments of virtualization-based security implementations are essential to identify potential exploitation vectors and maintain effective protection against similar vulnerabilities in the future.